Morgana is a young apprentice witch, with little patience for the school of witchcrafts, whose dream is to possess a magic broom. One day, her teacher Garagula's class is disrupted by two witches' shrieking moans. They are mourning the disappearance of the Great Moga, the country's greatest manufacturer of flying brooms. Morgana advances the possibility of a kidnapping and gets the attention of the dwarf Meco, Little Moga's brother, who asks her help in rescuing the magic broom maker. So while Garagula takes off to discuss the situation at the Great Council of Witches, Morgana and Mega get everything set to go and save the Great Moga, whom they believe has been kidnapped by the witch Malveta, who had been expelled from the Order due to her wicked temperament and eccentric behaviour.
While searching on following day the dense woods around the dwarf s house, they are startled by Pradoc, a floating being of great wisdom, who reveals to them that the reason for Great Moga's kidnapping may have been the fact that he is one of the very few initiated in the reading of the mnemomic code - the ancient atlantes' dialect. Upon arriving at the dwarf s house however, the witch is waiting and kidnaps Mega while casting a spell on Morgana, who is left unconscious and, as a side effect, with her hair tainted in a beautiful violet colour. While questioning her capacities and weeping in despair for a solution to find her friend, she finds again Pradoc, who encourages her and tells says that he saw Malveta taking the dwarf to the black pit, in the mysterious Burcelaine Forest. Racing there, she arrives at a deserted and sad place with leafless trees and, with her heart filled with fright, started descending the stairs through the well, into a seemingly endless depth. Once down and as soon as she finds some light she encounters an underground spectacular rocky scenery and encounters Gombotma, a strange but friendly creature with several eyes and enormous proportions, who feeds on the stalactites and complains of the lack of visitors. Morganas's newfound acquaintance shows her Malveta's shelter and, as she rushed there, she stumbles upon Mega, who had just tried to escape from the terrible witch. So Malveta ends up catching the two friends. The sorceress tells them she has captured the Great Moga so that he may decode a papyrus written by one of the last atlantes and which should disclose the location of the lost city of Atlantida - a great reservoir of knowledge. They quickly find the Great Moga imprisoned inside a magic circle, forced to translate the document under threat of his friends being burned by fire sent by wicked Malveta. The papyrus however, written in very formal language, reveals nothing on the lost city. And while impatient Malveta throws a furious fit, Morgana makes a spell that, like ali she has made so far, results in a violent explosion and liberates the three captives. Chased by the sorceress, they are rescued by Gombotma, who annulles uses the witch's fiery powers and tells everyone she knows the location of Atlantida: long-long time ago, one of her ancestors devoured the rock foundations it stood upon and, losing its ties to Earth, the city ascended to the skies, got caught in the eartiVs orbit and became our moon. The mean witch is driven mad by the place's inaccessibility, but Morgana and her friends return home pleased with the happy ending. Praised by the other witches, even if rebuked by her teacher for the risks she took, the apprentice witch receives from the hands of Mega and the Great Moga, as a token of gratitude, the magic broom she so much longed for.